[Haskell-cafe] setPermissions bug?

Simon Marlow simonmar at microsoft.com
Wed Feb 18 12:31:34 EST 2004

> I've run into a problem using Directory.setPermissions (or 
> equivalently System.Directory.setPermissions).
> Basically the problem is that
> getPermissions f >>= setPermissions f
> is not a noop.  Instead it is equivalent to
> chmod o-r f
> chmod g-r f
> etc
> I presume that this is a bug in setPermissions?

Yes, it's a bug.  However, since getPermissions/setPermissions doesn't
really give you enough control in Unix, I suggest you use the functions
available from System.Posix instead (fileStatus, fileMode, setFileMode


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